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trig$549169$ - translation to greek
WIKIMEDIA LIST ARTICLE
Trig Proofs
trig
σταματώ, εμποδίζω
Definition
trigonometry
Trigonometry is the branch of mathematics that is concerned with calculating the angles of triangles or the lengths of their sides.
N-UNCOUNT
Wikipedia
Proofs of trigonometric identities
There are several equivalent ways for defining trigonometric functions, and the proof of the trigonometric identities between them depend on the chosen definition. The oldest and somehow the most elementary definition is based on the geometry of right triangles. The proofs given in this article use this definition, and thus apply to non-negative angles not greater than a right angle. For greater and negative angles, see Trigonometric functions.
Other definitions, and therefore other proofs are based on the Taylor series of sine and cosine, or on the differential equation to which they are solutions.
